If you're investing in stocks with limited funds, then it's more important than ever to make sure you keep costs under control. One of the simplest ways is to avoid trading too often.

Today, I'm looking at two high-yield dividend stocks I believe could deliver a market-beating performance over the next few years.

A 7.9% yield I've bought

Shares in utility group SSE (LSE: SSE) are currently trading at a six-year low, with a forecast dividend yield of 7.9%.

I'm not sure this gloomy outlook is justified, having recently added SSE to my own portfolio. Although the group faces political pressure to cap prices and has lost customers to smaller rivals, the board is taking steps to address these problems.

SSE plans to combine its retail business with that of nPower, forming a new company. The new business will have a tighter focus on retail and greater scale, which should help with pricing. Meanwhile SSE should receive a share of the profits of the new business while being free to focus on its core business of gas and electricity production.

Too cheap to ignore?

In its most recent trading update, the company confirmed earnings and dividend guidance for the current year. This puts the stock on a forecast P/E of 10, with that prospective dividend yield of 7.9%.

Although such a high yield would normally be a warning that a cut might be likely, I'm prepared to accept this risk here. Even a 25% cut would still provide an attractive 6% yield, with the potential for future gains.

I believe SSE deserves a buy rating -- a view shared by 11 out of the 16 City brokers who cover the stock.

This cash-rich miner could be on a roll

Mining groups have made a stunning comeback over the last two years. But I reckon some companies in this sector could still be attractive for dividend investors. One stock I rate highly is South32 Ltd (LSE: S32), which was spun out of FTSE 100 giant BHP Billiton in 2015.

The Australia-based group published its half-year results today. Revenue rose by 8% to $3,494m during the six months to 31 December, while underlying operating profit rose by 5% to $724m.

The interim dividend will be increased by 19% to 4.3 cents and shareholders will also receive a special dividend of 3 cents per share.

These payouts look comfortably affordable to me. South32 ended the half-year with net cash of $1,431m, despite spending $426m on dividends and share buybacks during the period.

Why are the shares falling?

South32 shares have fallen by 6% following today's results. One source of pressure could be that volumes from some of the group's mines fell during the first half, due to technical challenges. Higher revenue and profit was mostly due to higher commodity prices, a benefit that may not recur during the second half.

However, I think it's worth noting that the group's cash balance accounts for 10% of its share price. On this basis, South32's forecast P/E of 13 and 4.3% yield look good value to me. I'd be happy to buy at these levels.

5 dividend stocks you might need

If you're tempted by the dividend yields at SSE and South32, then I believe you should also be interested in the stocks we've chosen for 5 Shares To Retire On.

This dividend investing report contains details of five companies -- including a utility -- which our analysts rate as lifetime income buys. I can't reveal the names of these stocks here, but I can tell you that this report is completely free and without obligation.

Roland Head owns shares of SSE. The Motley Fool UK has no position in any of the shares mentioned. Views expressed on the companies mentioned in this article are those of the writer and therefore may differ from the official recommendations we make in our subscription services such as Share Advisor, Hidden Winners and Pro. Here at The Motley Fool we believe that considering a diverse range of insights makes us better investors.

Let us send you our Newsletter

Our editors will email you a roundup of their favourite stories from across AOL